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本文档使用 PHP中文网手册 发布
(PHP 5 >= 5.2.0, PHP 7)
filter_input_array — 获取一系列外部变量,并且可以通过过滤器处理它们
$type
[, mixed $definition
[, bool $add_empty
= true
]] )这个函数当需要获取很多变量却不想重复调用 filter_input() 时很有用。
type
INPUT_GET
, INPUT_POST
,
INPUT_COOKIE
, INPUT_SERVER
, or
INPUT_ENV
之一。
definition
一个定义参数的数组。一个有效的键必须是一个包含变量名的 string ,一个有效的值要么是一个filter type,或者是一个 array 指明了过滤器、标示和选项。如果值是一个数组,那么它的有效的键可以是 filter, 用于指明 filter type,flags 用于指明任何想要用于过滤器的标示,或者 options 用于指明任何想要用于过滤器的选项。 参考下面的例子来更好的理解这段说明。
这个参数也可以是一个filter constant的整数。那么数组中的所有变量都会被这个过滤器所过滤。
add_empty
在返回值中添加 NULL
作为不存在的键。
如果成功的话返回一个所请求的变量的数组,如果失败的话返回 FALSE
。对于数组的值,如果过滤失败则返回 FALSE
,如果variable_name
不存在的话则返回 NULL
。
如果标示 FILTER_NULL_ON_FAILURE
被使用了,那么当变量不存在时返回 FALSE
,当过滤失败时返回 NULL
。
Example #1 一个 filter_input_array() 的例子
<?php
error_reporting ( E_ALL | E_STRICT );
$args = array(
'product_id' => FILTER_SANITIZE_ENCODED ,
'component' => array( 'filter' => FILTER_VALIDATE_INT ,
'flags' => FILTER_REQUIRE_ARRAY ,
'options' => array( 'min_range' => 1 , 'max_range' => 10 )
),
'versions' => FILTER_SANITIZE_ENCODED ,
'doesnotexist' => FILTER_VALIDATE_INT ,
'testscalar' => array(
'filter' => FILTER_VALIDATE_INT ,
'flags' => FILTER_REQUIRE_SCALAR ,
),
'testarray' => array(
'filter' => FILTER_VALIDATE_INT ,
'flags' => FILTER_REQUIRE_ARRAY ,
)
);
$myinputs = filter_input_array ( INPUT_POST , $args );
var_dump ( $myinputs );
echo "\n" ;
?>
以上例程会输出:
array(6) { ["product_id"]=> array(1) { [0]=> string(17) "libgd%3Cscript%3E" } ["component"]=> array(1) { [0]=> int(10) } ["versions"]=> array(1) { [0]=> string(6) "2.0.33" } ["doesnotexist"]=> NULL ["testscalar"]=> bool(false) ["testarray"]=> array(1) { [0]=> int(2) } }
版本 | 说明 |
---|---|
5.4.0 |
添加 add_empty 参数.
|
Note:
在
INPUT_SERVER
数组中并没有 REQUEST_TIME ,因为它是被稍后插入到 $_SERVER 中的。
[#1] sdupuis at blax dot ca [2014-01-21 21:36:55]
Note that although you can provide a default filter for the entire input array there is no way to provide a flag for that filter without building the entire definition array yourself.
So here is a small function that can alleviate this hassle!
<?php
function filter_input_array_with_default_flags($type, $filter, $flags, $add_empty = true) {
$loopThrough = array();
switch ($type) {
case INPUT_GET : $loopThrough = $_GET; break;
case INPUT_POST : $loopThrough = $_POST; break;
case INPUT_COOKIE : $loopThrough = $_COOKIE; break;
case INPUT_SERVER : $loopThrough = $_SERVER; break;
case INPUT_ENV : $loopThrough = $_ENV; break;
}
$args = array();
foreach ($loopThrough as $key=>$value) {
$args[$key] = array('filter'=>$filter, 'flags'=>$flags);
}
return filter_input_array($type, $args, $add_empty);
}
?>
[#2] CertaiN [2014-01-10 16:40:13]
[New Version]
Example Usage:
<?php
$_GET['A']['a'] = ' CORRECT(including some spaces) ';
$_GET['A']['b'] = ' CORRECT(including some spaces) ';
$_GET['A']['c'] = "Invalid UTF-8 sequence: \xe3\xe3\xe3";
$_GET['A']['d']['invalid_structure'] = 'INVALID';
$_GET['B']['a'] = ' CORRECT(including some spaces) ';
$_GET['B']['b'] = "Invalid UTF-8 sequence: \xe3\xe3\xe3";
$_GET['B']['c']['invalid_structure'] = 'INVALID';
$_GET['B']["Invalid UTF-8 sequence: \xe3\xe3\xe3"] = 'INVALID';
$_GET['C']['a'] = ' CORRECT(including some spaces) ';
$_GET['C']['b'] = "Invalid UTF-8 sequence: \xe3\xe3\xe3";
$_GET['C']['c']['invalid_structure'] = 'INVALID';
$_GET['C']["Invalid UTF-8 sequence: \xe3\xe3\xe3"] = 'INVALID';
$_GET['unneeded_item'] = 'UNNEEDED';
var_dump(filter_struct_utf8(INPUT_GET, array(
'A' => array(
'a' => '',
'b' => FILTER_STRUCT_TRIM,
'c' => '',
'd' => '',
),
'B' => FILTER_STRUCT_FORCE_ARRAY,
'C' => FILTER_STRUCT_FORCE_ARRAY | FILTER_STRUCT_TRIM,
)));
?>
Example Result:
array(3) {
["A"]=>
array(4) {
["a"]=>
string(36) " CORRECT(including some spaces) "
["b"]=>
string(30) "CORRECT(including some spaces)"
["c"]=>
string(0) ""
["d"]=>
string(0) ""
}
["B"]=>
array(3) {
["a"]=>
string(36) " CORRECT(including some spaces) "
["b"]=>
string(0) ""
["c"]=>
string(0) ""
}
["C"]=>
array(3) {
["a"]=>
string(30) "CORRECT(including some spaces)"
["b"]=>
string(0) ""
["c"]=>
string(0) ""
}
}
[#3] CertaiN [2014-01-10 16:39:46]
[New Version]
This function is very useful for filtering complicated array structure.
Also, Some integer bitmasks and invalid UTF-8 sequence detection are available.
Code:
<?php
define('FILTER_STRUCT_FORCE_ARRAY', 1);
define('FILTER_STRUCT_TRIM', 2);
define('FILTER_STRUCT_FULL_TRIM', 4);
function filter_struct_utf8($type, array $default) {
static $func = __FUNCTION__;
static $trim = "[\\x0-\x20\x7f]";
static $ftrim = "[\\x0-\x20\x7f\xc2\xa0\xe3\x80\x80]";
static $recursive_static = false;
if (!$recursive = $recursive_static) {
$types = array(
INPUT_GET => $_GET,
INPUT_POST => $_POST,
INPUT_COOKIE => $_COOKIE,
INPUT_REQUEST => $_REQUEST,
);
if (!isset($types[(int)$type])) {
throw new LogicException('unknown super global var type');
}
$var = $types[(int)$type];
$recursive_static = true;
} else {
$var = $type;
}
$ret = array();
foreach ($default as $key => $value) {
if ($is_int = is_int($value)) {
if (!($value | (
FILTER_STRUCT_FORCE_ARRAY |
FILTER_STRUCT_FULL_TRIM |
FILTER_STRUCT_TRIM
))) {
$recursive_static = false;
throw new LogicException('unknown bitmask');
}
if ($value & FILTER_STRUCT_FORCE_ARRAY) {
$tmp = array();
if (isset($var[$key])) {
foreach ((array)$var[$key] as $k => $v) {
if (!preg_match('//u', $k)){
continue;
}
$value &= FILTER_STRUCT_FULL_TRIM | FILTER_STRUCT_TRIM;
$tmp += array($k => $value ? $value : '');
}
}
$value = $tmp;
}
}
if ($isset = isset($var[$key]) and is_array($value)) {
$ret[$key] = $func($var[$key], $value);
} elseif (!$isset || is_array($var[$key])) {
$ret[$key] = null;
} elseif ($is_int && $value & FILTER_STRUCT_FULL_TRIM) {
$ret[$key] = preg_replace("/\A{$ftrim}++|{$ftrim}++\z/u", '', $var[$key]);
} elseif ($is_int && $value & FILTER_STRUCT_TRIM) {
$ret[$key] = preg_replace("/\A{$trim}++|{$trim}++\z/u", '', $var[$key]);
} else {
$ret[$key] = preg_replace('//u', '', $var[$key]);
}
if ($ret[$key] === null) {
$ret[$key] = $is_int ? '' : $value;
}
}
if (!$recursive) {
$recursive_static = false;
}
return $ret;
}
?>
[#4] CertaiN [2013-07-29 22:22:52]
This function is very useful for filtering complicated array structure.
Code:
<?php
function filter_request($var, $default_structure) {
$ret = array();
foreach ($default_structure as $key => $value) {
if (!isset($var[$key])) {
$ret[$key] = $value;
} elseif (is_array($value)) {
$ret[$key] = filter_request($var[$key], $value);
} elseif (is_array($var[$key])) {
$ret[$key] = $value;
} else {
$ret[$key] = $var[$key];
}
}
return $ret;
}
?>
Sample Usage:
<?php
$_GET['a']['wrong_structure'] = 'foo';
$_GET['b']['c'] = 'CORRECT';
$_GET['b']['d']['wrong_structure'] = 'bar';
$_GET['unneeded_item'] = 'baz';
var_dump(filter_request($_GET, array(
'a' => 'DEFAULT',
'b' => array(
'c' => 'DEFAULT',
'd' => 'DEFAULT',
),
)));
?>
Sample Result:
array(2) {
["a"]=>
string(21) "DEFAULT"
["b"]=>
array(2) {
["c"]=>
string(12) "CORRECT"
["d"]=>
string(21) "DEFAULT"
}
}
[#5] Anonymous [2010-04-22 12:12:35]
Beware: if none of the arguments is set, this function returns NULL, not an array of NULL values.
$args = array('some_post_var' => FILTER_VALIDATE_INT);
$myinputs = filter_input_array(INPUT_POST, $args);
var_dump($myinputs);
Expected Output: array(1) { ["some_post_var"]=> NULL }
Actual Output: NULL
[#6] ville at N0SPAM dot zydo dot com [2010-03-13 03:18:08]
While filtering input arrays, be careful of what flags you set besides FILTER_REQUIRE_ARRAY. For example, setting the flags like so:
<?php
$filter = array(
'myInputArr' => array('filter' => FILTER_SANITIZE_STRING,
'flags' => array('FILTER_FLAG_STRIP_LOW', 'FILTER_REQUIRE_ARRAY'))
);
$form_inputs = filter_input_array(INPUT_POST, $filter);
?>
.. will result in a blank $form_inputs['myInputArr'] regardless of what $_POST['myInputArr'] contains.
[#7] kibblewhite at live dot com [2009-01-26 07:35:37]
If you are trying to handling multiple form inputs with same name, then you must assign the `'flags' => FILTER_REQUIRE_ARRAY` to the definitions entry.
Example, you have a html form as such:
<form>
<input name="t1[]" value="Some string One" />
<input name="t1[]" value="Another String Two" />
</form>
Your definitions array will look a little like this:
$args = array(
't1' => array(
'name' => 't1',
'filter' => FILTER_SANITIZE_STRING,
'flags' => FILTER_REQUIRE_ARRAY)
);
[#8] kdeloach at gmail dot com [2008-08-12 12:42:10]
@iam4webwork
This is not specific to filter_input. If you have an element in HTML called names[], it can be accessed by calling $_POST['names'].
[#9] Kevin [2008-07-08 06:37:35]
Looks like filter_input_array isn't aware of changes to the input arrays that were made before calling filter_input_array. Instead, it always looks at the originally submitted input arrays.
So this will not work:
$_POST['my_float_field'] = str_replace(',','.',$_POST['my_float_field']);
$args = array('my_float_field',FILTER_VALIDATE_FLOAT);
$result = filter_input_array(INPUT_POST, $args);
[#10] phpnotes dot 20 dot zsh at spamgourmet dot com [2007-09-10 10:32:06]
The above example will actually output "NULL" because of the undefined variable doesnotexist - see http://bugs.php.net/bug.php?id=42608.
[#11] Sinured [2007-08-22 10:10:37]
extract() is a very convenient way of copying all those variables to the local scope. (see http://www.php.net/extract)
[#12] iam4webwork at NOSPAM dot hotmail dot com [2007-06-08 01:02:52]
The above example raises other questions such as how one would validate an html array. In the input form each input tag that refers to an html array would be named for example testarray[]. However, after the form is submitted, the syntax for validating the values is different from the expected $_POST['testarray[]']. Instead one has to drop the braces and validate as follows, assuming that testarray[] is supposed to be an html array of numerical values:
Valid test:
echo '*';
echo filter_input(
INPUT_POST,
'testarray',
FILTER_VALIDATE_INT,
FILTER_REQUIRE_ARRAY
);
echo '*';
But the following is an invalid test that results in 2 consequtive asterisks only!
echo '*';
echo filter_input(INPUT_POST,
'testarray[]',
FILTER_VALIDATE_INT,
FILTER_REQUIRE_ARRAY
);
echo '*';
So, there is a naming inconsistency going on, as after the form is submitted, one has to forget about the original name of the submitted array by dropping its braces. Maybe when the PECL/Filter extension is reviewed again, the great ones might consider making the syntax a little more forgiving.